cfs_str2num_check(char *str, int nob, unsigned *num,
unsigned min, unsigned max)
{
- char *endp;
-
- *num = simple_strtoul(str, &endp, 0);
- if (endp == str)
- return 0;
+ bool all_numbers = true;
+ char *endp, cache;
+ int len;
+ int rc;
+
+ endp = strim(str);
+ /**
+ * kstrouint can only handle strings composed
+ * of only numbers. We need to scan the string
+ * passed in for the first non-digit character
+ * and end the string at that location. If we
+ * don't find any non-digit character we still
+ * need to place a '\0' at position len since
+ * we are not interested in the rest of the
+ * string which is longer than len in size.
+ * After we are done the character at the
+ * position we placed '\0' must be restored.
+ */
+ len = min((int)strlen(endp), nob);
+ for (; endp < str + len; endp++) {
+ if (!isxdigit(*endp) && *endp != '-' &&
+ *endp != '+') {
+ all_numbers = false;
+ break;
+ }
+ }
- for (; endp < str + nob; endp++) {
- if (!isspace(*endp))
- return 0;
+ /* Eat trailing space */
+ if (!all_numbers && isspace(*endp)) {
+ all_numbers = true;
+ endp--;
}
+ cache = *endp;
+ *endp = '\0';
+
+ rc = kstrtouint(str, 0, num);
+ *endp = cache;
+ if (rc || !all_numbers)
+ return 0;
+
return (*num >= min && *num <= max);
}
EXPORT_SYMBOL(cfs_str2num_check);